Literally the best roommate.
-Girl
-Cute
-Not loud
-Good morals
-Not slut
-Not a backstabber
-Item box skill
-Cute

Now MC just needs the nurse girl to join their little commune. That's all you need for the apolypse.

I hate this sh1t when the author makes the protagonist this anti-social d1ckhead even though there's this cute and harmless creature asking for help and a safe place to live in.

MC you better protect and take care of the neet girl so she doesn't get robbed/hurt.

I wouldn't be surprised if that's her actual name, meaning she's some reincarnated person from other dimension. That would also explain her lack of knowledge.
Anyways she's cute and I would 100% move in with her if the opportunity presented itself during an apocalypse. Clearly she needs help with certain things, and I bet she has some skills of her own to help you right back. Just a symphatetic kinda person you just want to protect and take care of.

In the name of fairness and gender equality, MC should slap her right back, but twice as hard.

Great Sage was the obvious choice.
Honestly, is there anything greater and cooler than being a literal wizard in fantasy setting?
Also summoning and spirit magic? How fricking cool would that be.
He could just do some magic spell to make everyone forget he was there, or make himself invisible, etc..
Or just say he's about to have diarrhea, and run away. Besides, can't he just lie that he chose plebeian?
And if they want to see his card, so what if he refuses and/or runs away? Are they actually gonna hunt him?
This seems like such a minor & stupid problem that's blown out of proportions.

The whole "deathbringer" sh1t should be explained properly what it even means.

MC could and should be a freelancer. He could do anything besides being an assasin.
Like others have commented, no way he should have any duty to serve some b1tch just because his dad/master tells him to.

Surely he didn't have to go that far..
All he had to do was to ask the guy to knock him out, or stab few places of his limbs/torso.

They should just take every guy's face off who they kill (even if they just bury it somewhere close), because that much more of potential faces the beggars sect would have to keep track of..
Also what are these guys dicking around? They could've just escaped ANYWHERE off of that mountain when they had the time. Jeez.
This master of MC can fight, but when it comes to escaping and leaving no traces, he's not so great in that.

A game move would've been to leave tracks on the beach, as if they got on shore there, then circle back to the water walking on rocks, and then go to the opposite shore instead (considering they had enough time to swim accross without being seen).

But yeah. The luck stat of these two combined is probably -2

An assasin group whose
-base of operations is well known to the beggars sect (how stupid is that, really)
-sword sheats (&swords?) are marked, and easily traced back to them if left on crime scene (like literally, retarded. They should instead use unmarked gear, or stolen ones/with markings of other sects)
Also, they thought it was wiser to sit on their asses drinking through the night, instead of bailing out immediately when they knew the situation.

Yeah I'm not sure this level of "assasin" group is worth saving nor brinning back up again.
Also, that beggar dude doing the butchering is a disgusting SOB, since he's excited about doing it..
Most of the time beggars sect are portrayed as "orthodox", though of course that doesn't mean sh1t when it comes to actual morals.

-No witness for the murder
-He didn't tell anybody about the murder (except confessing it like a retard when he was caught)
-The guy who MC killed, surely had killed before, and even if not, surely was well disliked, and had enemies before that, meaning MC was not the only one with a motive to kill him.
-Nobody knows MC's face, except few people in his village, also he's still a kid growing up, meaning his looks would change as growing up. All he had to do was to change his name, and move somewhere "two villages over", since you could very easily do that.
-He shouldn't have hid. He should've just done business as usual after the murder, and play dumb. Also, he should've denied even if confronted, since only him and god knew for sure if he did it or not.
Yeah he's a kid, but still a stupid kid, even though the way he killed him was inventive.
To say he'd had to hide from some sect out there for the rest of his life, was a major exaggeration. Since nobody from that sect knew his (still changing) looks before MC acted like a guilty man when he speeded away.
Basically my point was, that MC had a choice to not become an assassin.

By MC's logic we should let criminals just do their sh*t, because otherwise they might take revenge, and that would be a bother for people? So MC regrets stopping that scumback for molesting Anri? Which is it.
The mental age of this MC is that of a child. Especially thinking he's well in his 30's, he's such a pathetic man.
(Actually makes you think that this author themself is way younger than this protagonist)
I really dislike it when japanese authors do this sh*t. Nobody wants to read stories about pathetic people, especially those who think themself are somehow pathetic.

Why didn't he heal Anri's father also??

This MC seems extremely naive, even stupid really.
The last time he left the other world, he was chased by a dragon(?).
Why he would ever go back without arming himself to the teeth? Even in this world, you don't want to go to a jungle or a national park (at least the ones in america), without a gun.
At least a bow/crossbow should be the very minimum, with some knives/machetes, and some pepper spray possibly.
A spear is also something you can make yourself.

If he says anything but "No I hate it here, this company suck and you're an incompetent boss", he is lying through his teeth.
Maybe it's because I'm not japanese, but the way how easy it is for these company slaves to bow down like that, it's nothing less of disgusting to myself.
Anyone who has even a bit of selfrespect for themself should never bow down to anyone else, even if they're apologizing. Actually I would go as far as to say that any man shouldn't ever bow down to other man. To a god, maybe then if needed.

This dude is so frail mentally. Clearly japanese society/work culture in some shitty office corporation, where you have no value, and where your boss takes the credit of you job well done and only shits on you when there is no credit to steal, is totally different than some isekai with monster & magic etc.
Still this guy should know better not take his frustration on to this girl who's only trying to give an advice from her own perspective.

If you can't stand it when the protagonist's IQ is closer to their shoe size (like Black Clover, Chainsaw-man, etc.) then don't bother reading this.
Not only is this protagonist the most gullible man on earth, he even lacks common sense, since he was raised in an institution where people are raised like cattle, meaning he has no life experience.
Gullible/naive/stupid/low IQ. This is the type of a protagonist that the author chose, for the manga they probably draw/create 16 hours a day & 6 days a week with minimum pay. Something I'll never be able to understand.

This artist should practice/develop their background art. It's either nonexistent (black or white), or some 3D-models, or it just looks like ass.
Also, the writing isn't very good. Still I hope all the best for this clearly rather newbie artist.